From: Linus Torvalds <torvalds@linux-foundation.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Oleg Nesterov <oleg@redhat.com>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Tejun Heo <tj@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
der.herr@hofr.at, Davidlohr Bueso <dave@stgolabs.net>,
Rik van Riel <riel@redhat.com>, Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: [RFC][PATCH 00/13] percpu rwsem -v2
Date: Mon, 22 Jun 2015 13:06:47 -0700 [thread overview]
Message-ID: <CA+55aFx5u6wzpxZTp2jAwQEb8W9sG=KzU7B61XQFKSSHNTaKzw@mail.gmail.com> (raw)
In-Reply-To: <20150622121623.291363374@infradead.org>
On Mon, Jun 22, 2015 at 5:16 AM, Peter Zijlstra <peterz@infradead.org> wrote:
>
> It further removes the stop_machine lglock usage, and with it kills lglocks.
Ok. With all the conversions, and removal of lglock, my dislike of
this goes away.
I'm somewhat worried about Daniel's report about "building a kernel
with 'make -j200' was extreme slow", but that may be due to something
else (does the machine have enough memory for "make -j200"? The kernel
compile parallelizes so well, and gcc uses so much memory, that you
need a *lot* of memory to use things like "-j200").
But assuming that gets sorted out, and somebody looks at the few file
locking performance issues, I have no objections to this series any
more.
Linus
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next prev parent reply other threads:[~2015-06-22 20:06 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-22 12:16 [RFC][PATCH 00/13] percpu rwsem -v2 Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 01/13] rcu: Create rcu_sync infrastructure Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 02/13] rcusync: Introduce struct rcu_sync_ops Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 03/13] rcusync: Add the CONFIG_PROVE_RCU checks Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 04/13] rcusync: Introduce rcu_sync_dtor() Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 05/13] percpu-rwsem: Optimize readers and reduce global impact Peter Zijlstra
2015-06-22 23:02 ` Oleg Nesterov
2015-06-23 7:28 ` Nicholas Mc Guire
2015-06-25 19:08 ` Peter Zijlstra
2015-06-25 19:17 ` Tejun Heo
2015-06-29 9:32 ` Peter Zijlstra
2015-06-29 15:12 ` Tejun Heo
2015-06-29 15:14 ` Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 06/13] percpu-rwsem: Provide percpu_down_read_trylock() Peter Zijlstra
2015-06-22 23:08 ` Oleg Nesterov
2015-06-22 12:16 ` [RFC][PATCH 07/13] sched: Reorder task_struct Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 08/13] percpu-rwsem: DEFINE_STATIC_PERCPU_RWSEM Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 09/13] hotplug: Replace hotplug lock with percpu-rwsem Peter Zijlstra
2015-06-22 22:57 ` Oleg Nesterov
2015-06-23 7:16 ` Peter Zijlstra
2015-06-23 17:01 ` Oleg Nesterov
2015-06-23 17:53 ` Peter Zijlstra
2015-06-24 13:50 ` Oleg Nesterov
2015-06-24 14:13 ` Peter Zijlstra
2015-06-24 15:12 ` Oleg Nesterov
2015-06-24 16:15 ` Peter Zijlstra
2015-06-28 23:56 ` [PATCH 0/3] percpu-rwsem: introduce percpu_rw_semaphore->recursive mode Oleg Nesterov
2015-06-28 23:56 ` [PATCH 1/3] rcusync: introduce rcu_sync_struct->exclusive mode Oleg Nesterov
2015-06-28 23:56 ` [PATCH 2/3] percpu-rwsem: don't use percpu_rw_semaphore->rw_sem to exclude writers Oleg Nesterov
2015-06-28 23:56 ` [PATCH 3/3] percpu-rwsem: introduce percpu_rw_semaphore->recursive mode Oleg Nesterov
2015-06-22 12:16 ` [RFC][PATCH 10/13] fs/locks: Replace lg_global with a percpu-rwsem Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 11/13] fs/locks: Replace lg_local with a per-cpu spinlock Peter Zijlstra
2015-06-23 0:19 ` Oleg Nesterov
2015-06-22 12:16 ` [RFC][PATCH 12/13] stop_machine: Remove lglock Peter Zijlstra
2015-06-22 22:21 ` Oleg Nesterov
2015-06-23 10:09 ` Peter Zijlstra
2015-06-23 10:55 ` Peter Zijlstra
2015-06-23 11:20 ` Peter Zijlstra
2015-06-23 13:08 ` Peter Zijlstra
2015-06-23 16:36 ` Oleg Nesterov
2015-06-23 17:30 ` Paul E. McKenney
2015-06-23 18:04 ` Peter Zijlstra
2015-06-23 18:26 ` Paul E. McKenney
2015-06-23 19:05 ` Paul E. McKenney
2015-06-24 2:23 ` Paul E. McKenney
2015-06-24 8:32 ` Peter Zijlstra
2015-06-24 9:31 ` Peter Zijlstra
2015-06-24 13:48 ` Paul E. McKenney
2015-06-24 15:01 ` Paul E. McKenney
2015-06-24 15:34 ` Peter Zijlstra
2015-06-24 7:35 ` Peter Zijlstra
2015-06-24 8:42 ` Ingo Molnar
2015-06-24 13:39 ` Paul E. McKenney
2015-06-24 13:43 ` Ingo Molnar
2015-06-24 14:03 ` Paul E. McKenney
2015-06-24 14:50 ` Paul E. McKenney
2015-06-24 15:01 ` Peter Zijlstra
2015-06-24 15:27 ` Paul E. McKenney
2015-06-24 15:40 ` Peter Zijlstra
2015-06-24 16:09 ` Paul E. McKenney
2015-06-24 16:42 ` Peter Zijlstra
2015-06-24 17:10 ` Paul E. McKenney
2015-06-24 17:20 ` Paul E. McKenney
2015-06-24 17:29 ` Peter Zijlstra
2015-06-24 17:28 ` Peter Zijlstra
2015-06-24 17:32 ` Peter Zijlstra
2015-06-24 18:14 ` Peter Zijlstra
2015-06-24 17:58 ` Peter Zijlstra
2015-06-25 3:23 ` Paul E. McKenney
2015-06-25 11:07 ` Peter Zijlstra
2015-06-25 13:47 ` Paul E. McKenney
2015-06-25 14:20 ` Peter Zijlstra
2015-06-25 14:51 ` Paul E. McKenney
2015-06-26 12:32 ` Peter Zijlstra
2015-06-26 16:14 ` Paul E. McKenney
2015-06-29 7:56 ` Peter Zijlstra
2015-06-30 21:32 ` Paul E. McKenney
2015-07-01 11:56 ` Peter Zijlstra
2015-07-01 15:56 ` Paul E. McKenney
2015-07-01 16:16 ` Peter Zijlstra
2015-07-01 18:45 ` Paul E. McKenney
2015-06-23 14:39 ` Paul E. McKenney
2015-06-23 16:20 ` Oleg Nesterov
2015-06-23 17:24 ` Oleg Nesterov
2015-06-25 19:18 ` Peter Zijlstra
2015-06-22 12:16 ` [RFC][PATCH 13/13] locking: " Peter Zijlstra
2015-06-22 12:36 ` [RFC][PATCH 00/13] percpu rwsem -v2 Peter Zijlstra
2015-06-22 18:11 ` Daniel Wagner
2015-06-22 19:05 ` Peter Zijlstra
2015-06-23 9:35 ` Daniel Wagner
2015-06-23 10:00 ` Ingo Molnar
2015-06-23 14:34 ` Peter Zijlstra
2015-06-23 14:56 ` Daniel Wagner
2015-06-23 17:50 ` Peter Zijlstra
2015-06-23 19:36 ` Peter Zijlstra
2015-06-24 8:46 ` Ingo Molnar
2015-06-24 9:01 ` Peter Zijlstra
2015-06-24 9:18 ` Daniel Wagner
2015-07-01 5:57 ` Daniel Wagner
2015-07-01 21:54 ` Linus Torvalds
2015-07-02 9:41 ` Peter Zijlstra
2015-07-20 5:53 ` Daniel Wagner
2015-07-20 18:44 ` Linus Torvalds
2015-06-22 20:06 ` Linus Torvalds [this message]
2015-06-23 16:10 ` Davidlohr Bueso
2015-06-23 16:21 ` Peter Zijlstra
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